Detailed Product Description CNG pressure gauge ,install on to Gas Pipe,through check gas pressure, then send to switch to display the gas ... , 1/4BSP, black steel case, snap-on polycarbonate window with electronic board on the window, brass internals and connection, dual ... , 1/4BSP, black steel case, snap-on polycarbonate window with electronic board on the window, brass internals and connection, dual ...